Add more warnings
Add more warnings

renderTaraget and renderStrategy are not allowed to be modified once
context was initialized.

Change-Id: Ic0aa493b4e686a063c318a1d1ec912c176e47ed4
Reviewed-by: Michael Brasser <acf66a4a6ae67569abc58c29c7a264afd3e1cc1c@nokia.com>

matthewvogt/qtdeclarative,matthewvogt/qtdeclarative,qmlc/qtdeclarative,corngood/qtdeclarative,matthewvogt/qtdeclarative,corngood/qtdeclarative,qmlc/qtdeclarative,mgrunditz/qtdeclarative-2d,qmlc/qtdeclarative,crobertd/qtdeclarative,jfaust/qtdeclarative,qmlc/qtdeclarative,mgrunditz/qtdeclarative-2d,crobertd/qtdeclarative,corngood/qtdeclarative,matthewvogt/qtdeclarative,matthewvogt/qtdeclarative,matthewvogt/qtdeclarative,jfaust/qtdeclarative,mgrunditz/qtdeclarative-2d,corngood/qtdeclarative,crobertd/qtdeclarative,corngood/qtdeclarative,qmlc/qtdeclarative,matthewvogt/qtdeclarative,jfaust/qtdeclarative,jfaust/qtdeclarative,jfaust/qtdeclarative,crobertd/qtdeclarative,matthewvogt/qtdeclarative,qmlc/qtdeclarative,mgrunditz/qtdeclarative-2d,corngood/qtdeclarative,mgrunditz/qtdeclarative-2d,crobertd/qtdeclarative,mgrunditz/qtdeclarative-2d,qmlc/qtdeclarative,corngood/qtdeclarative,jfaust/qtdeclarative,jfaust/qtdeclarative,crobertd/qtdeclarative,crobertd/qtdeclarative,mgrunditz/qtdeclarative-2d,qmlc/qtdeclarative